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Masonry Paint over Oil-based paint

Posted: Fri Jun 28, 2019 1:21 pm
by Gummo
The front of my terraced-house has always been painted with oil-based gloss. I want to use a masonry paint instead - is this possible? If so, would a thorough abrasion with a wire brush suffice to key the surface?

Also, would you recommend, Sandtex, Johnstone's or Dulux?

Masonry Paint over Oil-based paint

Posted: Thu Aug 22, 2019 9:56 am
by wickedwjc
No expert but my guess is it's not gonna work unless all the existing oil based paint is removed.

It's called masonry paint as it's designed to go onto masonry - if you put it onto something else (i.e. on top of oil based paint) then it probably won't adhere to the surface or dry properly and therefore won't last very long. Probably not what you want to do but could you use the same type of paint again? Alternatively you could use chemicals to remove the existing and get back to the original masonry.

Masonry Paint over Oil-based paint

Posted: Thu Aug 22, 2019 10:14 am
by Desmondo15
You just need an adhesion primer first then crack on.

Masonry Paint over Oil-based paint

Posted: Thu Aug 22, 2019 6:14 pm
by Gummo
Someone's recommended Zinsser Bullseye 123 - it claims to be paintable, without sanding, over almost anything. I'm going to sand and try it before masonry paint.

I'll let you know how it goes.

Masonry Paint over Oil-based paint

Posted: Thu Aug 22, 2019 8:48 pm
by Desmondo15
Give it several days to fully adhere, think it says 7 from memory.

Masonry Paint over Oil-based paint

Posted: Thu Aug 22, 2019 9:29 pm
by Gummo
Will do - thanks.

Masonry Paint over Oil-based paint

Posted: Mon Aug 26, 2019 7:27 pm
by Gummo
Well, I Zinssered it on Friday and applied two coats of masonary paint on Sunday. Everything went like a dream - I'm mightily relieved.

Thanks for your help.